Freddy Ye 36b7c30b29 [X86, MC] Recognize OSIZE=64b when EVEX.W = 1, EVEX.pp = 01 (#103816) ...

In the legacy space, if both the 66 prefix and REX.W=1 are present, the
REX.W=1 takes precedence and makes OSIZE=64b. EVEX map 4 inherits this
convention, with EVEX.pp=01 and EVEX.W playing the roles of the 66
prefix and REX.W. So if EVEX.pp=00, the OSIZE can only be 64b or 32b,
depending on whether EVEX.W=1 or not. But if EVEX.pp=01, then OSIZE is
either 64b or 16b depending on whether EVEX.W=1 or not.

2024-08-29 18:22:26 +08:00

44 KiB

Raw Blame History

View Raw